384 BOTANICAL GAZETTE [MAY 
wounding, etc. There isno more evidence of this than of fascicled 
foliage in the cordaitean forms. 
In addition to those whose assistance I have already acknowl- 
edged in the body of this article, I am indebted to the directors of 
the following botanic gardens for the privilege of studying and 
securing much of the material for this article: the Royal Botanic 
Gardens, Edinburgh; Der Kénigliche Botanische Garten, Berlin; 
Jardin Botanique de |’Etat, Brussels; the University Garden, 
Cambridge; and the Royal Botanic Gardens, Kew. By the 
courtesy of Mr. L. A. Boopte, I was enabled to photograph several 
of the specimens in the Jodrell Laboratory. Most of the seedling 
material was grown in the University Garden here. 
UNIVERSITY OF TORONTO 
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